Study: Marijuana May Change the Brain in Young Adults

Marijuana image via shutterstock

A groundbreaking new study led by Northwestern University and Massachusetts General Hospital/Harvard Medical School researchers says that recreational marijuana use may not be as harmless as we originally thought. The research, which was aimed at understanding the long-term effects of low to moderate marijuana use on the brain, found previously unidentified brain changes.

The size and shape of two brain regions involved in emotion and motivation may differ in young adults who smoke marijuana at least once a week, according to the study published April 16 in The Journal of Neuroscience. 

According to the National Survey on Drug Use and Mental Health, marijuana is the most commonly used illicit drug in the U.S., with an estimated 18.9 million people reporting recent use. Marijuana use is often associated with motivation, attention, learning, and memory impairments. The Society for Neuroscience reports that previous studies exposing animals to tetrahydrocannabinol (THC) — the main psychoactive component of marijuana — show that repeated exposure to the drug causes structural changes in brain regions involved with these functions. However, most previous studies do not show how low to moderate marijuana use affects the brain of teens and young adults.

In the current study, Jodi Gilman, PhD and Anne Blood, PhD, of Mass General, and Hans Breiter, MD, of Northwestern compared MRIs of the brains of 18- to 25-year olds who reported smoking marijuana at least once per week with those with little to no history of marijuana use. According to the study:

Although psychiatric evaluations ruled out the possibility that the marijuana users were dependent on the drug, imaging data revealed they had significant brain differences. The nucleus accumbens — a brain region known to be involved in reward processing — was larger and altered in its shape and structure in the marijuana users compared to non-users.

“This study suggests that even light to moderate recreational marijuana use can cause changes in brain anatomy,” said Carl Lupica, PhD, who studies drug addiction at the National Institute on Drug Abuse, and was not involved with this study. “These observations are particularly interesting because previous studies have focused primarily on the brains of heavy marijuana smokers, and have largely ignored the brains of casual users.”

The team of scientists compared the size, shape, and density of the nucleus accumbens and the amygdala — a brain region that plays a central role in emotion — in 20 marijuana users and 20 non-users. Each marijuana user was asked to estimate their drug consumption over a three-month period, including the number of days they smoked and the amount of the drug consumed each day.  The scientists found that the more the marijuana users reported consuming, the greater the abnormalities in the nucleus accumbens and amygdala. The shape and density of both of these regions also differed between marijuana users and non-users.

“This study raises a strong challenge to the idea that casual marijuana use isn’t associated with bad consequences,” Breiter said.